![]() These vary in severity, and begin 3 to 14 days after being bitten. About 20% of infected people develop symptoms. Ībout 80% of those infected with West Nile virus (WNV) show no symptoms and go unreported. A surveillance system in birds is useful for early detection of a potential human outbreak. Severe disease may also occur in horses, for which a vaccine is available. In the United States thousands of cases are reported a year, with most occurring in August and September. WNV has occurred in Europe, Africa, Asia, Australia, and North America. The virus was discovered in Uganda in 1937, and was first detected in North America in 1999. There is no specific treatment for the disease pain medications may reduce symptoms. When mosquitoes cannot be avoided, mosquito repellent, window screens, and mosquito nets reduce the likelihood of being bitten. Mosquito populations may be reduced by eliminating standing pools of water, such as in old tires, buckets, gutters, and swimming pools. The best way to reduce the risk of infection is to avoid mosquito bites. Diagnosis is typically based on symptoms and blood tests. Risks for severe disease include being over 60 years old and having other health problems. Rarely the virus is spread through blood transfusions, organ transplants, or from mother to baby during pregnancy, delivery, or breastfeeding, but it otherwise does not spread directly between people. West Nile virus (WNV) is usually spread by mosquitoes that become infected when they feed on infected birds, which often carry the disease. The risk of death among those in whom the nervous system is affected is about 10 percent. In less than 1% of people, encephalitis or meningitis occurs, with associated neck stiffness, confusion, or seizures. About 20% of people develop a fever, headache, vomiting, or a rash. In about 80% of infections people have few or no symptoms. West Nile fever is an infection by the West Nile virus, which is typically spread by mosquitoes. Reducing mosquitoes, preventing mosquito bites ġ0% risk of death among those seriously affected Nonreactive when tested using a licensed serologic test for syphilis.None, fever, headache, vomiting or diarrhea and muscle aches rash (RNA and DNA) for blood collected in states where Babesia testing is required by FDA. Nonreactive when tested using a licensed NAT for Babesia spp.
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